Async, Exceptions and Library Design – Bill Wagner discusses the exception handling behaviour of async methods, looking at how they wrap exceptions up in faulted tasks, and shares a technique to add in synchronous exceptions for things you consider to be programming mistakes like argument exceptions.

Parallel and The C# Memory Model – Bnaya Eshet discusses how the same program utilising parallel programming will operate differently depending on the execution environment, with the build mode and presence of a debugger altering the behaviour, and shares links to some articles on the subject which go deeper.